/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.transforms.reflect;



import com.bff.gaia.unified.sdk.transforms.DoFn;



/** Static utilities for working with {@link DoFnInvoker}. */

public class DoFnInvokers {



  /**

   * Returns an {@link DoFnInvoker} for the given {@link DoFn}, using a default choice of {@link

   * DoFnInvokerFactory}.

   *

   * <p>The default is permitted to change at any time. Users of this method may not depend on any

   * details {@link DoFnInvokerFactory}-specific details of the invoker. Today it is {@link

   * ByteBuddyDoFnInvokerFactory}.

   */

  public static <InputT, OutputT> DoFnInvoker<InputT, OutputT> invokerFor(

      DoFn<InputT, OutputT> fn) {

    return ByteBuddyDoFnInvokerFactory.only().newByteBuddyInvoker(fn);

  }



  private DoFnInvokers() {}



  /**

   * Tries to invoke setup on the given {@link DoFn}. If setup throws any exception, the given

   * {@link DoFn} will be torn down immediately and the exception rethrown.

   *

   * <p>On success returns an {@link DoFnInvoker} for the given {@link DoFn}.

   */

  public static <InputT, OutputT> DoFnInvoker<InputT, OutputT> tryInvokeSetupFor(

      DoFn<InputT, OutputT> fn) {

    DoFnInvoker<InputT, OutputT> doFnInvoker = invokerFor(fn);

    try {

      doFnInvoker.invokeSetup();

    } catch (Exception e) {

      try {

        doFnInvoker.invokeTeardown();

      } catch (Exception suppressed) {

        e.addSuppressed(suppressed);

      }

      throw e;

    }

    return doFnInvoker;

  }

}